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Tag: "stimulation" at biology news

Computational analysis shows that plant hormones often go it alone

...ounds complex, it answers a simple question: After stimulation with seven different growth hormones, are the same or different genes activated? The teamwork model would predict yes, but Chory's team found otherwise. Co-lead authors Jennifer L. Nemhauser, Ph.D., a former postdoctoral fellow in Chory's lab and n...

T cells activated to fight HIV basis for dendritic cell therapeutic vaccine

...4 T cells to release IL-12, which in turn triggers stimulation of killer CD8 cells that are specific to the virus. Reporting at AIDS 2006, Xiao-Li Huang, M.D., research assistant professor of infectious diseases and microbiology at GSPH, said that IL-12 could be increased when CD40 ligand, a substance that bin...

Life and death in the hippocampus: what young neurons need to survive

... of new brain cells," says Gage. "Now we show that stimulation may, in part, be mediated through the NMDA receptor." Those studies had also shown that young and middle-aged "exercised" rats perform better on learning tasks such as maze swimming, indicating that new neurons are more than just a backup supply bu...

Septum keeps neurons in synch, can reduce epileptic seizures by 90 percent

...an injection of carbachol, or by using the sensory stimulation method of pinching the tail.) The amplitude and frequency of the theta rhythm of the epileptic rats was significantly altered compared to the control group. In effect, the theta rhythm became faster and more jittery. Also, the septal neurons of epi...

Possible birthplace of malignant brain tumors identified

Researchers have found that abnormal stimulation of a cellular trigger that normally regulates repl... tumor-like growths in mice. Removing the abnormal stimulation causes the growths to regress--a finding the researchers said suggests a possible treatment for the ...

Stanford doctors advance in bid to turn mice stem cells into blood vessels

...ing controlled chemical, electrical and mechanical stimulation to the stem cells. Bioreactors have been used for centuries as fermentation chambers for growing organisms such as bacteria and yeast, but only recently have they been used in stem cell research labs. "Oscar is the first one to really create an envi...

Food-crop yields in future greenhouse-gas conditions lower than expected

...ice, wheat and soybeans, and possibly little or no stimulation for C4 crops that include maize and sorghum," said Stephen P. Long, a U. of I. plant biologist and crop scientist. FACE technology, such as the SoyFACE project at Illinois, allows researchers to grow crops in open-air fields, with elevated levels of...

Ritalin packs punch by elevating norepinephrine, suppressing nerve signal transmissions

... the rat's sensory pathway response to the whisker stimulation when receiving two different doses of methylphenidate. They found that both the low and moderate doses of methylphenidate: Elevated norepinephrine in the area of the brain that processes information related to whisker movement. Norepinephrine helps...

Mayo Clinic researchers discover cancer cells may move via wave stimulation

...ntional light microscope. They form in response to stimulation from EGF and exist for 10 to 20 minutes before disappearing. Waves intrigue researchers because wave-based internalization of activated EGFR to the interior of the cell was a previously unknown mechanism. The wave pathway appears to be a parallel pat...

Obese people are more sensitive to pain, suggests study

... knees. Participants were given a mild electrical stimulation on their left ankle to measure their pain reflex. ...owed a greater physical response to the electrical stimulation than did the non-obese people, both before and after the training session. This indicates they had a...

New insight into machinery of immune cells' 'tentacles'

...ore effectively to fight infection; or to damp its stimulation in autoimmune disease. Led by Duke University Medical Center pharmacologist Ann Marie Pendergast, the researchers published their findings in the Jan. 10, 2006, issue of Current Biology. The research was sponsored by the National Institutes of Healt...

Rare Chinese frogs communicate by means of ultrasonic sound

...g said. Another frog did not respond to ultrasonic stimulation but produced calls 18 times to an audible prompt. Clearly, Feng said, some of the frogs indeed communicated ultrasonically. They have the ability to do so, but for some reason some frogs do and some don't, he said. "We believe that all of them have ...

Botox could help target resistant tumors for treatment

...ficantly greater delays in tumor growth as well as stimulation of apoptosis (programmed cellular death) when compared by irradiation without Botox. The combination of Botox and the chemotherapeutic agent cyclophosphamide showed significantly stunted tumor growth after three days, as well. Since Botox is used ...

Stanford study of owls finds link in brain between sight and sound

...n as that encoded by the stimulated site. The same stimulation suppressed the auditory system's response to sounds coming from other locations. Selecting certain kinds of information to be processed, while ignoring others, is the root of attention. What was previously known about the mechanism of attention was ...

Mechanism for memory revealed in neurons of electric fish

... original stimulus is gone. "There is short-term stimulation that results in long-term changes in excitability," says Zakon, professor of neurobiology. "Essentially, it is memory." The electric fish studied by Zakon and Oestreich discharge electrical signals to survey their environment and communicate with ea...

BiovaxID?yields 89 percent survival in patients with aggressive non-Hodgkins

...ymphocytes, which mediate cell responses to immune stimulation ("cellular" immunity). B-cell lymphocytes can undergo malignant transformation to become non-Hogkins lymphoma, multiple myeloma or chronic lymphocytic leukemia. "This is the first human cancer vaccine study to see T-cell responses in the absence of ...

Living taste cells produced outside the body

... vitro system, our results demonstrate that direct stimulation from nerves is not necessary to generate taste cells from precursors." By using the cultured taste cells, researchers now have more precise control over the cell's surrounding environment, as well as better access to subcellular mechanisms, allowi...

Feeling old?

...of a co-ordinated linkage between the meal-related stimulation of protein synthesis and the inhibition of breakdown." ...

Have a taste for fat? Yes! A sensor in the mouth promotes preference for fatty foods

...AT) as the sensor for fat. They show that lingual stimulation of CD36 by fatty acids influences behavioral and digestive physiology. CD36 gene inactivation fully abolishes both the spontaneous preference for fat and the changes in gastrointenstinal secretions mediated by oral delivery of lipids. These findings...

Sooner is better with cochlear implants, Stanford scientist shows

...ains learn to understand the artificial electrical stimulation that the implants provide to the cochlea as sound. A Stanford neurobiologist teamed with child-development specialists at the University of Maryland to see if children with cochlear implants were able to meld their newly acquired hearing capability ...

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